Update README.md

README.md

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 # Accords-CMS
-A simple CMS written in PHP
+A simple CMS written in PHP. Pages are stored as JSON files, and the content is written in Markdown. 
+
+## Functionalities
+
+### Login
+ - Login page at /login
+ - Support multiple users
+ - Uses PHP built-in `password_hash` and `password_verify` for storing password and authentication
+
+### Pages
+ - Create, edit, and delete pages
+ - Change a page slug (the URL to reach the page)
+ - Pages have metadata such as the creation time, modification time, author, and title.
+
+## Todo
+
+### Accounts
+ - Being able to create, edit, delete account
+ - Support for user roles: Admin, Editor, Author, Contributor, and Subscriber (like WordPress)
+ - Maybe add a registration form
+
+### Images
+ - Being able to create, delete images
+ - Autoremoval of EXIF metadata (like GPS coordinates)
+ - Autoconvertion to standard format (WebP and Jpg)
+ - Backend gallery of all uploaded image
+ - Being able to edit the metadata (alt)
+
+### Pages
+ - Ability to add tags
+
+### Tags
+ - Ability to create, edit, delete tags
+ - Ability to create, edit, delete type of tags
+